Flood Warning — Cook County, IL, Lake County, IN 10:00 AM Flood Warning — Cook County, IL 2:51 PM Beach Hazards Statement — Lake, IL, Northern Cook, IL, Central Cook, IL, Lake, IN, Porter, IN 10:00 AM

Chicago, Illinois

Last updated: 9:31 PM CDT  ·  Refresh
25°C
Feels like 28°
Rain
▲ 27°  /  ▼ 21°
Wind
8 mph SSW
Humidity
87%
Dew Point
23°
Pressure
29.00 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
44%
Sunrise
5:40 AM
Sunset
8:14 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Chicago is currently rain at 25°C. Precipitation is likely — peak probability 57% around 10 PM. Atmospheric instability is elevated (CAPE up to 2062 J/kg) — isolated convective development possible. Sunrise: 5:40AM · Sunset: 8:14PM.

Alerts

Flood Warning
Cook County, IL, Lake County, IN
Expires 10:00 AM
Flood Warning
Cook County, IL
Expires 2:51 PM
Beach Hazards Statement
Lake, IL, Northern Cook, IL, Central Cook, IL, Lake, IN, Porter, IN
Expires 10:00 AM
54 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
25°
50%
10 PM
26°
56%
11 PM
26°
32%
12 AM
26°
32%
1 AM
25°
19%
2 AM
24°
5%
3 AM
23°
6%
4 AM
23°
6%
5 AM
21°
6%
6 AM
21°
19%
7 AM
21°
19%
8 AM
22°
6%
9 AM
22°
3%
10 AM
23°
3%
11 AM
23°
3%
12 PM
24°
3%
1 PM
21°
3%
2 PM
22°
3%
3 PM
22°
3%
4 PM
21°
3%
5 PM
23°
3%
6 PM
22°
3%
7 PM
22°
3%
8 PM
21°
3%
7-Day Forecast
Tonight
27° 21°
Rain, 50% chance.
Tue
26° 21°
Haze with a 32% chance of rain.
Wed
28° 19°
Clear.
Thu
29° 22°
Partly Cloudy with a 25% chance of rain.
Fri
26° 18°
Drizzle, 64% chance.
Sat
27° 19°
Rain, 69% chance.
Sun
26° 20°
Clear.
TimeTempConditionsPrecipWindHumidity
Now 25° Rain 50% 8 mph SSW 87%
10 PM 26° Rain 56% 7 mph SW 87%
11 PM 26° Clear 32% 8 mph WSW 81%
12 AM 26° Mostly Clear 32% 8 mph W 76%
1 AM 25° Partly Cloudy 19% 8 mph NW 76%
2 AM 24° Partly Cloudy 5% 10 mph NNW 81%
3 AM 23° Mostly Cloudy 6% 13 mph N 86%
4 AM 23° Overcast 6% 13 mph N 88%
5 AM 21° Overcast 6% 13 mph N 87%
6 AM 21° Haze 19% 12 mph N 87%
7 AM 21° Haze 19% 12 mph N 84%
8 AM 22° Mostly Cloudy 6% 12 mph N 80%
9 AM 22° Overcast 3% 13 mph N 76%
10 AM 23° Mostly Cloudy 3% 13 mph N 73%
11 AM 23° Mostly Cloudy 3% 13 mph N 70%
12 PM 24° Partly Cloudy 3% 13 mph N 67%
1 PM 21° Mostly Clear 3% 13 mph N 62%
2 PM 22° Mostly Clear 3% 13 mph N 56%
3 PM 22° Mostly Clear 3% 13 mph N 51%
4 PM 21° Mostly Clear 3% 13 mph N 49%
5 PM 23° Mostly Clear 3% 13 mph N 50%
6 PM 22° Mostly Clear 3% 13 mph N 52%
7 PM 22° Mostly Clear 3% 13 mph N 54%
8 PM 21° Partly Cloudy 3% 12 mph N 57%
15-Day Forecast
Today
7/27
Rain
50%
21°
27°
Tue
7/28
Haze
32%
21°
26°
Wed
7/29
Clear
7%
19°
28°
Thu
7/30
Partly Cloudy
25%
22°
29°
Fri
7/31
Drizzle
64%
18°
26°
Sat
8/1
Rain
69%
19°
27°
Sun
8/2
Clear
17%
20°
26°
Mon
8/3
Clear
8%
19°
27°
Tue
8/4
Drizzle
44%
21°
30°
Wed
8/5
Drizzle
66%
22°
31°
Thu
8/6
Rain
64%
21°
29°
Fri
8/7
Drizzle
60%
21°
29°
Sat
8/8
Drizzle
60%
21°
26°
Sun
8/9
Drizzle
60%
21°
26°
Mon
8/10
Drizzle
60%
21°
26°
54
Moderate
U.S. Air Quality Index · Dominant: PM2.5
50 100 150 200

Air quality is acceptable. Unusually sensitive people should consider limiting prolonged outdoor exertion.

Pollutant Breakdown · Today
PM2.5
Fine particulate matter
Dominant
54 AQI 10.9 µg/m³
O3
Ground-level ozone
43 AQI 46 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 54 Moderate 43 54
Wed 32 Good 32 19
Thu 34 Good 34 32
About the Air Quality Index
0–50 Good
51–100 Moderate
101–150 Unhealthy for Sensitive Groups
151–200 Unhealthy
201–300 Very Unhealthy
301–500 Hazardous

The U.S. AQI runs 0–500. The overall value equals the highest individual pollutant sub-index, and the dominant pollutant is the one driving it. PM2.5 (fine particles) is reported in µg/m³ and ozone (O3) in ppb. Forecast source: NWS NAQFC.

1000850700500400300250200150100 -40-30-20-10010203040 0.41247101624 LCLLFCEL0°C Temperature (°C) Pressure (hPa)
Temp Dewpoint Parcel (SB) CAPE CIN Dry adiabat Moist adiabat Mixing ratio
RAP
Valid Tue Jul 28, 01:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 50 60 70 80 90 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE1149 J/kg
MLCAPE1963 J/kg
MUCAPE3417 J/kg
SBCIN0 J/kg
MLCIN0 J/kg
Lifted Index-4.5
Kinematics
0–6 km Shear51 kt
0–1 km Shear23 kt
Eff. Shear56 kt
0–1 km SRH212
0–3 km SRH128
Eff. SRH128
Storm Motion280° @ 35 kt
0–1 km EHI1.5
Composite Parameters
Sig. Tornado2.5
STP (eff)1.6
Supercell12.6
K-Index29.6
Thermo & Levels
PWAT1.77 in
0–3 km LR4.4 °C/km
700–500 LR6.6 °C/km
Total Totals51.7
LCL953 hPa
LFC982 hPa
EL223 hPa
Freezing Lvl16,050 ft